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. 2017 Jun 12;17:84. doi: 10.1186/s12911-017-0483-8

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — An example of directed acyclic graph (DAG) for identifying severity level (SAC1: extreme risk; SAC2: high risk; SAC3: medium risk; SAC4: low risk): each node is a binary classifier for two levels of incidents. A decision of rejecting one of the two levels is made at each node